What will they construct them of then? Hemp or bamboo turbin's? Alternators have to be built of what? Transmission wires and insulation out of what?
It's currently impossible to eliminate the carbon footprint of the green energy now or in the future. If one wants to go back to the wooden water wheel or the windmills of old that had generators for electricity production using no nails and you want to live in a world of 12 volt lighting and wood burning stoves that requires carbon footprint to produce the wire and the glass in the oil fired lamps, no AC and wood burning heat, your screwed. It will never get to total green energy. You can call fudd but in reality, all of that relies on technology that creates carbon footprint in its inception and its duration.
There is absolutely nothing that can be called totally green other than a teepee with a wood fire in the middle of it.
Are you ready for that?
No, Dennis, no! The wood fire will produce CO2 and ash! You'll need to cuddle up with your squaw (or brave) and your dogs to stay warm! (Cooking will be a problem, though....)
Woody